Electroextraction of heavy metals from wastewater for the protection of natural water bodies from pollution
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 1, Issue 10
Abstract
<p>The most promising methods of eluates recycling are electrolysis and electrodialysis. It is possible to obtain metals and purified regeneration solutions for repeated regeneration in case of application of electrochemical methods. The processes of electrolysis of solutions of cadmium and zinc sulfates and chlorides in electrolysers of different types were explored, the influence of conditions of electrolysis on effectiveness of extraction and separation of metals, obtaining inorganic acids for repeated usage in regeneration processes was determined.</p><p>Single- and double-chamber electrolysers, in which cathode was made of stainless steel and titanium anode was covered with ruthenium oxide, were used. Cathodic and anodic areas in double-chamber electrolysers were separated by the anion exchange membrane MA-41.</p><p>Solution of cadmium sulfate or of zinc sulfate was found in the cathodic chamber in double-chamber electrolysers. Solution of sulfuric acid with concentration of 50 mg-equiv./dm<sup>3</sup> was in the anodic chamber.</p><p>It is recommended to carry out electrolysis for two hours when using a single-chamber electrolyser at a voltage of 5 V with the purpose of removing cadmium from sulfuric acid solution and reusing regeneration solution of sulfuric acid. Almost complete removal of cadmium ions and concentration of sulfuric acid in anolyte is achieved in case of using a double-chamber electrolyser. However, in terms of power saving, release of cadmium should be performed in single-chamber electrolysers.</p><p>However, it is recommended to perform zinc removal from eluates in double-chamber electrolysers. In this case, zinc ions are almost completely removed within four hours at voltage of 25 V. The maximum current efficiency is 42‒80 %.</p>Conditions of separation of zinc and cadmium in the eluate are associated with acidity of the solutions. A stage-by-stage removal of metals – cadmium followed by zinc, is observed during electrolysis of the mixture of cadmium and zinc chlorides in a single-chamber electrolyser. Current efficiency of metals is 30–68 %. In the case of electrolysis of a mixture of zinc and cadmium sulfates, only cadmium (В=100 %) is removed from the solution, while zinc ions completely remain in solution. Zinc is released only at the transfer of the electrolyte to a double-chamber electrolyser
Authors and Affiliations
Nikolai Gomelia, Ganna Trokhymenko, Olena Hlushko, Tatiana Shabliy
Keywords
Related Articles
- EP ID EP527814
- DOI 10.15587/1729-4061.2018.123929
- Views 89
- Downloads 0
Studying the effect of the combined technology on durability of the shafttype parts
<p>Restoration of shaft parts with extending their service life is an important reserve of development and growth of repair efficiency. Improvement of wear resistance and durability of parts of agricultural machinery is...
Simulation of a gas and air flow exhausted by production equipment
<p>The paper provides the results of researching the influence of the gas and air flow at the exit from the pipeline of the technological channel on the performance of a gas and air power unit. It has been determined tha...
Development of a new process for expanding stepped tapered rings
A new method for expanding large-size tapered rings with a stepped profile has been considered. The proposed method consists in expanding the blank with the help of a stepped die. A procedure for conducting studies by th...
Development of technical component of the methodology for projectvector management of educational environments
<p class="a">We propose tools for planning and administration of the technological component of the methodology of project-vector management of educational environments that were implemented in the applied information te...
Assessment of capabilities of military groupings (forces) based on the functional group “Engage”
<p class="a"><span lang="EN-US">An approach to assessing the capabilities of groupings of troops (force</span><span lang="EN-US">s) based on the use of the combinatorial method with the limited base of arguments on the e...